jenkins



A. F. JENKINS@ oxYAcETYLeNE CUTTING ToRcH.

I APPLICATION FILED JULY 6. I9`I7. 1,318,356,

2 SHEETS-SHEET I- Putented OUI'. 14, 1919.

f gnou/T101,

y of the head;

ALEXANDER F. JENKINS, OE BLTEMQRET MARYLAND.

GXYACETYLENE CUTfNG-TRCH 1 pplieation led July 6, 19t?. Serial No. 179,003.

To (1U whom it may nouw/fn.'

Be it known 'that l, ALEXANDER l?. JEN- KINS, a citizen ot the United States. residing at Baltimore, lllarylaud. have invented certain new and useful improvements in Oxyacetylene Clittiiig-'loit-lies, of which the following is a specification.

This invention relates to Oxy-acetylene Welding and cutting torchc:-` and has for its object to provide a torch of this clase` enibodying improvements rendering` it of great n'lechanical strength and durability and prometing eaSe and convenience in operation.l

The invention will be Vfully disclosed in the following description, taken in connection. with the accompanying draui'ingsfin Which:

Figure 1 is a side View of the torch, part being broken away;

Fig. iena vertical longitudinal section of portions of the torch drawn to a larger scale;

Fig 3 is a plan View ot the base of a burner tip;

Fig. l is a. plan View of the seating surface Fig. 5 is a Section along the line 5 5 in Fig. 1;

Fig. G is a'section along the line (3 6 ot Fig. 1;

Fig'. 7 is a section along the line 7 7 of Fig. 2;

Fig. 8 is an elevation ot the trigger tor operating the oxygen valve;

Fig. 9 is a section along the line 9 Fig. 8; and

Fig. 1G is a plan View ot the hase et' a modified forni of burner tip.

The torch cou'iprisefs two principal portions, the handle 10 connected to the source of gas supply and containing the gas controlling mechanism, and the head 1l. to which the burner tip 1Q is secured, The head 11 is supported at a distance from the handle by the threepipes 13, 14 and n15,

which serve the two purposes of conveying'` the to the head and supporting the same. y

The handle portion 10 consists of a casing 16 which is adapted to be grasped by the hand when the torch is in use, abody ineinber 17, at one end thereof, a blocle18 (see Fig. 1) at the,A other end thereof, and tivo gas pipes 19 and Q() rigidly connectingthe body and block and rigidly securing them together. The casing 16 is cylindrical and Specification of Letters Patent.

handle.

Patented @et 14tgige .is secured to the block 18 by screws 21. Each of the tivo pipesI 19 and 20 connect With a, flexible gas supply pipe through which the oxygen and acetylene is conif'eyed. to the 6( torch trom suitable containers or reservoirs,

the oxygen bein;r conducted into pipe 20 Iand the acetylene into pipe 19. y l

The body 17 has three ducts passing' therethrough in a general longitudinal direction', 6e

for transmitting the gases from the pipes 1S) and Z0 to the pipes 13,114., and 15, two of the ducts, indicated by 22 and in the drawings, connecting the oxygen pipe 2O with the oxygen pipes 13 and 14, and the 70 duct 24 connecting the acetylene 19 with the pipe 15 which convey@ the acetylene to the head. Each of th'e two oxygen ducts 22 and Q3 has a regulating valve intermediate its-y ends tor governing the flow of gas there- '15,

through, the flow of acetylene being controlled by the valve 25 at the` rear of the The duet Q2 through which the oxygen passes of the torch,A has an enlarged lateral chamber QG closed at the ends by Screw plugs 2T and 28. and having therein a valve 29 mounted upon the `Valve Stein 30 and nor lnally held against the annular valve Seat 3185 by the coiled compression Spring 32. rhe 'face of the valve is preferably provided with a rubber Washer 33 to prevent the leakage of the gas, which is under high pressure. The

valve Seat 31 is formed on the end ot the 90 .larger part of the transverse chamber 26,. and when the valve 29 is seated thereon no oxygen can from the larger portion of 'the chamber to the smaller. which is the direction of flou' of the gas in paseing through 95 the duet. This iskclearly indicated in Fie. 5, in which dotted lines indicate the points 'Where the gue enters the larger portion of chamber 26, and leaves the smallenportion.

The pressure ot the oxygen being behind the valve when the latter is closed, tende to maintaii'i it tightly closed, and. thus minimizes leakage.

The valve'stein`- 30 extends through, and

is of Smaller cross Section 'than the smaller 105 part ofthe chamber 26, thus permitting gas to fioul into said chamber. The stern Il() ralso extends through the screw lplug 28 to the exterior ot thebody where its rounded end is adapted to coperate with the triffrer '34 to open the valve aga-inst the pressure of thel Spring, and of the compressed 'gas heto what is known as the cuttingjet 80 to close.

' vided on the inner side of ,its upper end,

with the inclided or cam surface'36, which comes in contact with the rounded end of valve stem 30 when the upper port-ion of the trigger is moved forward to wedge or push the valve rod inwardly. A stop 37 1s also provided to properly limit the movement of the trigger in opening the valve. To allow thevalve to be closed by the spring 32 the trigger is simply moved in the reverse direction iby pushing the -lower part forward or by drawing the upper part bacl with the thumb.

The inclined surface 36 is so shaped that when the valve is vopened the friction between theinclined portion andthe end of valve stem 30 is suficient to prevent any accidental movement of the trlgger to release the, valve; Thisenables the operator to turn. the cutting jet on and then. remove his hand, from the controlling trigger without cutting the jet off, which isa 4very de sirable feature in such a device.

The oxygen passing through duet 23 is regulated by needle valve 38 having the convenient handle 39. The needle valve 38 is of the usual type and is operated by the left hand in using the torch.l

The pipes 13, 14 and l5, are screw thread-i ed into one face of the L-shaped head 11 and communicate with ducts therein which conduct the gases through thehead and deliver them iinmi'xed to the burner tip. The oxygen entering the head from pipe 13 is conducted through the L-shaped duct 40 to a recess 41, in that face ofythe head against' which the tip 1s seated while the oxygen entering through the pipe 14 and the acetylene entering through pipe 15' are conveyed to the annular recesses 42 and 43 concentric with therecess 41. As shown bythe dotted lines in I1`igs. '2 and 7 these last two mentioned ducts branch within the head in o1'- der to convey thev gases to the opposite sides of the concei'itric recesses. In Fig; `7 the ducts have been shown distorted in order to clearly illustrate this. InF-ig. 4'fthe orifices of' the several ducts above mentioned are clearly shown.

The concentric walls of recesses 41, 42 and 43, are indicated by 44, 45 and 46 in the drawings, and the top or end surfaces of these walls abut tightly against the plane surface of the base of the tip 12, so that the gases cannot inix at this point. I have found 1t very desirable to make the endsor bearing surfaces of these walls of equal area,

notwithstanding their different circiinifcn ences, in order that each will ofl'cr the saine resistance to the abutting sui-face of the tip when the latter is clamped tothe head. Iii' the bearing surfaces of the concentric u'zills are unequal in area the' weaker walls will be crushed when the tip is securely attached, hence the innermost wal] is thickest, the intermediate wall thinner and the outermost wall still thinner. The burner ti p .12 is provided with ducts for leading the gases from. the recesses 41, 42 and 43 to the point 4of the tip, where they are burned. An axial duct 47 receives the oxygen from the rc` cess 41 in the head and leads it to the center point of the tip, while ducts 48 and 49, with the short 'branches 50 and 51' therefrom rcspectively, convey the gases; from the annular recesses 42 and 43 to the point of the tip, the ducts 48 and 49 converging slightly'. as they near the point. i

Oxygen uninixed with other gases and under high pressure issues from the duct 47, and this jet is known as .the cutting jet, While oxygen at a somewhat lo 'er pressure (as regulated 'by needle valvei38)ne1iers essl 42 and f ducts 48 and 49 froinannular r draws-acetylene into these duc ffrmthe branches 50 and 51 respectively byan injector action, due to its` vigher pressure. The duets 48 ,and 49 are thus mixing tubes.

Neal' the base of the tip is an annular flange 52 Whichis'engagethby the flange 53 of the sleevel nut 54 which is screw threaded I to the head. This inode of attachment allows the 'tip to be easi] detached and cleaned or turned or a diflerent one substituted.

In handling'the torch when the tip is not attached thereto and in handling the tip' itself apart from the torch, the seating surfaces which are adapted to abut when they4 parts are together are exposed and are liable to be injured byrough or careless handling.

fAs these surfaces inustbe true andfit tightly together to prevent gas leakage I provide both the head and the tip with annular flanges 55 and 56 respectively, which extend beyond the seating surfaces in question and protect them from injury when dropped or roughly handled. The fiange 5.6 on the tip is received within the annular recess 57 in the head, Whichreeess is made deep enough to prevent the flange from seatingand perf.

surface provided with gas orifices and With a circular iange surrounding the said ori-V abut against a.y seating surface of the other part, said concentric seating surfaces being substantially equal in area.

3. In a cutting and Welding torch, a liandle having a body portion provided with gas ducts passing therethrough, a laterally movable valve within said body for opening and closing one of said ducts, a trigger Without said body and arranged to be oscillated in a plane parallel to the longitudinal axis of said torch handle, and means on said trigger for operating said valve.

In a cutting and welding torch, a body portion having a gas duct passing therethrough, a valve in said duet, vhaving a valve stein extending to 'the outside of said body, a spring normally holding the valve in its closed position, and means for opening the valve and holding it open against the tension of the spring, said means eoinprisii g a trigger pivotally secured to said body to move in a' plane parallel to the axis of the body and bearing against the end of the valve stem, said trigger being manually operable an'd constructed With'v valve operating surfaces whereby the trigger is adapted to remain in one position to hold the valve open or in another position to allow the valve to remain closed.

In a cutting and, Welding torch, a'body portion having a gas duct passing ytherethrough, a portion of said duct extending laterally of said body and being enlarged to forni a chamber, a laterally movable valve in said chamber adapted to seat against one end thereof to interrupt the fiow o? gas, a spring in said chamber normally holding said valve against its seat, a valve stein extending Without the body portion, and'nieans for operating said valve and stem, said means comprising a trigger pivotally secured to the bodyv and having at its upper end an inclined surface adaped to 'bear against the outer end of the valve stein and to move the latter to open the valve against the tension of the spring A when the trigger is moved in one direction, and to allow the spring to close the valve when the trigger is moved in the opposite direction, said trigger being adapted to be manually operated and to remain in either of its positions when so placed.

In testimony whereof I affix my signature.

ALEXANDER F. JENKINS. 

